PORT ST. LUCIE – Mike Pelfrey can’t put odds on his chances for winning a spot in the rotation.

“I don’t really know what’s going to happen,” the 23-year-old right-hander said yesterday at Mets camp. “I’m just one of the seven guys going to compete, and I’m just going to go out and do my best, and whatever happens, happens.”

The 6-foot-7 Pelfrey is actually among nine pitchers, not seven, competing for a one of three slots – a group that includes Pelfrey, John Maine, Oliver Perez, Philip Humber, Chan Ho Park, Aaron Sele, Jorge Sosa, Jason Vargas and Alay Soler. Pelfrey, Maine, Humber and Vargas already are in camp.

“I’m just trying to get back in to it, and just trying to get myself ready so I can compete and get ready hopefully to win a job,” Pelfrey said.

Pelfrey, who is throwing a slider and changeup in addition to his fastball, said physically he is “good to go.”

Last year he went 2-1 with a 5.48 ERA in four starts. He was 7-3 with a 2.48 mark in 18 starts in the minors.

*

There are a few locker switches in the Mets spring clubhouse. Aaron Heilman is next to Billy Wagner, and next to Heilman is Scott Schoeneweis, followed by Duaner Sanchez and Guillermo Mota.

Tom Glavine has Steve Trachsel‘s old locker, which is now next to Maine, Perez, Orlando Hernandez, an empty locker and Pedro Martinez. Former Rangers teammates Julio Franco (48 years old) and Ruben Sierra (41) are also next to each other.

*

The Mets have changed their spring training uniforms slightly, going with shirts that have an orange swatch under each armpit. The jerseys also are now pullovers. Last year they had buttons down the front. . . . The Mets designated minor league infielder Ruben Gotay for assignment in order to clear a spot for Park on the 40-man roster.